Honeywell Thermostat Rth221b Wiring Diagram

If you have a system that both heats and cools your house you need a more complex thermostat with more wire terminals and if your system. If any wires are not attached to the terminals of your old thermostat you do not need to label them as they will not be connected to your new thermostat. 66 elegant honeywell thermostat installation 6 wire.

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